package 校测第二次模拟;

public class Main1 {

	public static void main(String[] args) {
		int[] F = new int[100];
		F[0] = F[1] = 1;
		int i = 2;
		while(true) {
			F[i] = F[i-1] + F[i-2];
			if (F[i] > 20211001) {
				System.out.println(i + 1);
				break;
			}
			i++;
		}
		

	}

}
